'We've got a huge plan': WA premier looks to the future

He was upbeat as he voted at a primary school in his electorate of Kwinana, later posing for the cameras as he ate a democracy sausage.

"I'm just getting started. I've only been in this role for 18 months now. I'm super energised," he told reporters.

"My intention is to go long. We've got a huge plan."

Mr Cook became premier in 2023 after former premier Mark McGowan led the party to an unprecedented landslide victory in 2021, when it secured 53 of 59 seats in the WA lower house.

Labor is expected to lose some seats, with surveys predicting a 12-13 per cent swing that could put up to 11 seats within reach of the Liberal Party.

Mr Cook was having none of it when asked about the prediction, saying he said the party would campaign until the close of the polls for every seat.

"There's no acceptable number. No one likes to lose in politics," he said, as he vies to be returned as premier in his own right.

The Liberals and Nationals, who have three seats each, need a swing of more than 20 per cent to form a coalition government.

That is not on the cards, but the Liberals are expected to regain previously safe Perth seats in the inner city and western suburbs.

Liberal leader Libby Mettam has fought valiantly during the campaign against a confident and cashed-up Labor party.

She has refused to discuss the likelihood of her party losing while battling questions about her leadership and candidates accused of poor behaviour, controversial comments and derogatory social media posts.

But even if the conservatives reclaim every seat lost in 2021, Labor would still be in office with its healthy majority from 2017, when it secured 41 lower house seats. The Liberals won 13 and the Nationals five.

"The important message that we're making is that people's vote is very powerful," she told reporters outside a polling booth in Perth's southern suburbs. 

"If nothing changes, if Labor is re-elected, we will see the same Labor values for the next four years."

Asked if she had already written her concession speech, Ms Mettam said: "I'm just focused on getting out and about talking to people."

"I appreciate it's a David and Goliath battle, but the vote is in the people of Western Australian people's hands."

Cost of living and housing are the main issues for WA voters.

Health, education, regional services, state infrastructure and crime have also been targeted by the parties during the campaign.

Local resident Brendan Brown was among the hundreds of people queuing to vote at the booth.

"If it ain't broke don't fix it," he said as he backed Labor for the win.

"Things are going in the right direction ... I don't see there's any alternatives."

Shirley Reilly said Labor had too much power in its last term and WA needed a stronger opposition to hold it to account.

"We need more balance," she said.

Rusted-on Liberal supporter Rod Reynolds was thrilled to meet Ms Mettam as she handed out how-to-vote cards and greeted voters.

"Libby Mettam is a lot better looking than Roger Cook," he joked when asked why he backed her party.